^Because the third decided to hide Naruto's father from the village.
Yup. Just what I was thinking.^
The fact that Naruto is the 4ths son would put him in danger, and thus the 3rd decided to keep it a secret. I mean, wouldn't it be a bit too obvious if he were to be named Namikaze, and resemble his father that much... then have people claim they aren't related?
i guess it just proves when the hokage says to keep a secret u keep a secret lolIt just seems kind of odd that no one outside of a select group of jounins knows who naruto's father is, I mean, shouldn't it be kind of obvious? I'm surprised noone's guessed.